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When a female, usually large breasted, intentionally or unintentionally wears a bra with a cup size larger than her own breasts. This effect will become teasingly apparent when coupled with the low cut and/or sleeveless blouse, spaghetti strap top or summer dress. As a witness to this undercupping effect, one will have the opportunity to witness top boob and possibly side boob depending on how a woman positions herself and her breasts fail to entirely fill her bra cups and thus remain exposed to the extent that the bra allows.
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